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Balance Sheet Details and Other Financial Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Income taxes paid	$ 147.5	$ 138.4	$ 110.3
Supplemental non-cash investing activities:
Equipment transfers from inventory to property, plant, and equipment	$ 65.8	$ 39.3	$ 26.7

X

- Definition

Transfer from Inventory

+ References

No definition available.

+ Details

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Namespace Prefix:	isrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- References

No definition available.

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